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Abstract

AAPG Bulletin, V. 100, No. 9 (September 2016), P. 1443-1468.

Copyright ©2016. The American Association of Petroleum Geologists. All rights reserved.

DOI: 10.1306/04041615023

Previous HitStructuralNext Hit Previous HitinversionNext Hit, imbricate wedging, and out-of-sequence thrusting in the southern Junggar fold-and-thrust belt, northern Tian Shan, Previous HitChinaNext Hit

Shuwei Guan,1 Joseph M. Stockmeyer,2 John H. Shaw,3 Andreas Plesch,4 and Jian Zhang5

1Research Institute for Petroleum Exploration and Development, PetroChina, 20 Xue Yuan Rd, Haidian District, Beijing, Previous HitChinaNext Hit 100083; [email protected]
2Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138; present address: Chevron, 1500 Louisiana Street, Houston, Texas 77002; [email protected]
3Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138; [email protected]
4Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138; [email protected]
5Research Institute of Petroleum Exploration and Development, Xinjiang Oilfield Company, 2 Youhao South Road, Urumqi, Xinjiang, Previous HitChinaNext Hit 830000; [email protected]

ABSTRACT

Accurate definition of Previous HitstructuralNext Hit style in subsurface interpretation is critically important for understanding the deformation history of fold-and-thrust belts, as well as assessing the petroleum prospectivity of Previous HitstructuralNext Hit traps. Using two- and three-dimensional Previous HitseismicNext Hit reflection surveys, well Previous HitdataNext Hit, field mapping, forward models, and balanced cross sections, we describe the Previous HitstructuralNext Hit styles across the actively deforming southern Junggar fold-and-thrust belt in northwestern Previous HitChinaNext Hit, a basin undergoing petroleum exploration and development operations. Subsurface interpretations indicate several folds in the basin overlie Jurassic normal faults that were tectonically inverted in the Late Jurassic to Early Cretaceous. Following Previous HitinversionNext Hit, multiple detachment levels propagated northward Previous HitfromNext Hit the Tian Shan and formed a series of imbricated fault-related folds. The most prominent fold trend in southern Junggar consists of the Tugulu, Manas, and Huoerguosi anticlines, which trap hydrocarbons in clastic Eocene reservoirs. These structures exhibit complex internal geometries, with coeval forethrusts and backthrusts forming imbricated Previous HitstructuralNext Hit wedges. In the latest stages of deformation, and continuing at present, the uppermost thrust sheet, the Southern Junggar Thrust (SJT), truncated the backlimbs of these Previous HitstructuralNext Hit traps, implying the SJT is a tectonically active, out-of-sequence thrust. Previous HitFromNext Hit these interpretations, we present a model for how the southern Junggar fold-and-thrust belt developed Previous HitfromNext Hit Jurassic to present. Moreover, we detail how fold growth, fault activity, and Previous HitstructuralNext Hit style affected charge histories, trap formation, and reservoir compartmentalization. Our results have direct implications for assessment of the southern Junggar petroleum system as well as other complex fold-and-thrust belts.

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